Portable humidifier



FIG. 1 is a front, top, and side perspective view of a portable humidifier showing our new design;

FIG. 2 is a front elevation view;

FIG. 3 is a rear elevation view;

FIG. 4 is an elevation from the same side as in FIG. 2;

FIG. 5 is an elevation view from the side opposite that in FIG. 4;

FIG. 6 is a top view; and,

FIG. 7 is a bottom view.

The portions of the portable humidifier shown in dotted lines do not constitute a part of the claimed design. 

CLAIM The ornamental design for a portable humidifier, as shown and described. 